Rand Index and Rand Index corrected/adjusted for chance for comparing partitions (Hubert and Arabie, 1985). The names of the clusters do not matter.
rand(tab)
rand2(clu1, clu2)
crand(tab)
crand2(clu1, clu2)The two partitions to be compared, given in the from of vectors, where for each unit a cluster membership is given.
A contingency table obtaind as table(clu1,clu2)
The value of Rand Index (corrected/adjusted for chance)
Hubert L. in Arabie P. (1985): Comparing Partitions. Journal of Classification, 2, 193-218.